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poizon [28]
3 years ago
13

Please help on number 3

Mathematics
1 answer:
kobusy [5.1K]3 years ago
5 0

Answer:

Its the first option.

Step-by-step explanation:

3x + y = 5

5x - 4y = -3

From equation 1:

y = - 3x + 5

Substituting for y:

5x - 4(-3x + 5) = -3

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Answer:  h=\frac{m}{69}

Step-by-step explanation:

For this exercise is necessary to remember the following formula:

V=\frac{d}{t}

Where "V" is the speed, "d" is the distance and "t" is the time.

In this case you must solve for the time, then:

tV=d\\\\t=\frac{d}{V}

Based on the information provided in the exercise, you can identify that:

V=69\\\\t=h\\\\d=m

Therefore, knowing this, you can make the substitution into the formula t=\frac{d}{V}.

Through this procedure you get that the equation that can be used to find the amount of hours "h" that it will take Sandra to drive "m" miles at her constant speed, is:

h=\frac{m}{69}

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Step-by-step explanation:

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